I’m using a quick theme for the time being. But basically where the grey bars are for the categories e.g. CMS, Web, Client Side I’m wanting to add some + and – icons which will open and close those sections.

Right. The code can be improved. Please feel free to do so on your site. The owner of this site is not worried about it right now. There’s always room for improvement. Sometimes you need to just call it good and move forward.

Yes I know what software they are using (I have used it in the past) What I’m looking for is a simple way to add similar functionality to bbPress. I like the solution proposed by chrishajer but it has flaws.